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We study the intervalley scattering in defected graphene by low-temperaturetransport measurements. The scattering rate is strongly suppressed when defectsare charged. This finding highlights "screening" of the short-range part of apotential by the long-range part. Experiments on calcium-adsorbed grapheneconfirm the role of a long-range Coulomb potential. This effect is applicableto other multivalley systems, provided that the charge state of a defect can beelectrically tuned. Our result provides a means to electrically control valleyrelaxation and has important implications in valley dynamics in valleytronicmaterials.

Electrical control of intervalley scattering in graphene via the charge state of defects